Operating Temperature Range ......................... -40°C to +105°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 16 TQFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
48°C/W
7°C/W
T1633+4
21-0136
90-0031
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated
│
2
MAX5974A/MAX5974B/
MAX5974C/MAX5974D
Electrical Characteristics
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
(V
IN
= 12V (for MAX5974A/MAX5974C, bring V
IN
up to 17V for startup), V
CS
= V
CSSC
= V
DITHER/SYNC
= V
FB
= V
FFB
= V
DCLMP
= V
GND
,
V
EN
= +2V, NDRV = AUXDRV = SS = COMP = unconnected, R
RT
= 34.8kΩ, R
DT
= 25kΩ, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX5974B,
MAX5974C, MAX5974D), T
A
= -40°C to +105°C (MAX5974A), unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MAX5974A/C
Bootstrap UVLO Wakeup Level
V
INUVR
V
IN
rising
-40°C to
+85°C
-40°C to
+125°C
MIN
15.4
8
7.95
6.65
6.6
17
-40°C to +85°C
TYP
16
8.4
8.4
7
7
18.5
100
MAX
16.5
8.85
8.85
7.35
7.35
20
150
µA
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
1.17
1.17
UNITS
UNDERVOLTAGE LOCKOUT/STARTUP (IN)
MAX5974B/D
V
Bootstrap UVLO Shutdown
Level
IN Clamp Voltage
V
INUVF
V
IN_CLAMP
V
IN
falling
I
IN
= 2mA (sinking)
V
IN
= +15V (for
MAX5974A/C);
V
IN
= +7.5V (for
MAX5974B/D), when
in bootstrap UVLO
V
IN
= +12V
-40°C to +85°C
-40°C to +125°C
V
V
IN Supply Current in
Undervoltage Lockout
I
START
100
1.8
1.8
1.215
1.2155
250
3
4
1.26
1.2655
IN Supply Current After Startup
ENABLE (EN)
Enable Threshold
I
C
mA
V
ENR
V
ENF
V
EN
rising
V
EN
falling
-40°C to +85°C
-40°C to +105°C
1.09
1.085
1.14
1.14
1.19
1.19
1
1.5
V
Input Current
OSCILLATOR (RT)
RT Bias Voltage
NDRV Switching Frequency
Range
NDRV Switching Frequency
Accuracy
I
EN
µA
V
RT
f
SW
-40°C to +85°C
-40°C to +105°C
D
MAX
f
SW
= 250kHz
-40°C to +85°C
-40°C to +125°C
100
-8
-11
79
79
2.91
1.23
600
+8
V
kHz
%
+11
80
80
82
83
%
Maximum Duty Cycle
SYNCHRONIZATION (SYNC)
Synchronization Logic-High
Input
Synchronization Pulse Width
Synchronization Frequency
Range
V
IH-SYNC
V
50
ns
2x
f
SW
kHz
f
SYNCIN
1.1 x
f
SW
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Maxim Integrated
│
3
MAX5974A/MAX5974B/
MAX5974C/MAX5974D
Electrical Characteristics (continued)
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
(V
IN
= 12V (for MAX5974A/MAX5974C, bring V
IN
up to 17V for startup), V
CS
= V
CSSC
= V
DITHER/SYNC
= V
FB
= V
FFB
= V
DCLMP
= V
GND
,
V
EN
= +2V, NDRV = AUXDRV = SS = COMP = unconnected, R
RT
= 34.8kΩ, R
DT
= 25kΩ, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX5974B,
MAX5974C, MAX5974D), T
A
= -40°C to +105°C (MAX5974A), unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Maximum Duty Cycle During
Synchronization
DITHERING RAMP GENERATOR (DITHER)
Charging Current
Discharging Current
Ramp’s High Trip Point
Ramp’s Low Trip Point
SOFT-START AND RESTART (SS)
Charging Current
I
SS-CH
I
SS-D
Discharging Current
I
SS-DH
V
SS-DTH
t
RSTRT-MIN
V
SS-DMAX
I
DCLMP
V
DCLMP-R
V
SS-HI
D
MAX
(typ) = (V
SS-DMAX
/2.43V)
V
DCLMP
= 0 to 5V
D
MAX
(typ) =
1 - (V
DCLMP/
2.43V)
I
NDRV
(sinking) =
100mA
0
-100
V
DCLMP
= 0.5V
V
DCLMP
= 1V
V
DCLMP
= 2V
-40°C to +85°C
-40°C to +125°C
73
54
14.7
0
75.4
56
16.5
1.9
1.9
4.7
1
0.65
t
NDRV-R
R
AUX-N
R
AUX-P
t
NDRV-F
C
NDRV
= 1nF
C
NDRV
= 1nF
I
AUXDRV
(sinking) =
50mA
-40°C to +85°C
-40°C to +125°C
14
27
4.3
4.3
10.6
0.5
7.7
7.95
18.9
-40°C to +85°C
-40°C to +125°C
V
SS
= 2V, normal shutdown
(V
EN
< V
ENF
or V
IN
< V
INUVF
),
V
SS
= 2V, hiccup mode discharge for
t
RSTRT
(Note 2)
9.5
9
0.65
1.6
10
10
1.34
2
0.15
1024
5
2
+100
77.5
58
18.3
3.4
3.5
8.3
%
10.5
11
2
2.4
µA
mA
µA
V
Clock
Cycles
V
V
nA
V
DITHER
= 0V
V
DITHER
= 2.2V
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
45
44.5
43
42
50
50
50
50
2
0.4
55
55.5
57
58
µA
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
%
D
MAX
x f
SYNC
/
f
SW
Discharge Threshold to Disable
Hiccup and Restart
Minimum Restart Time During
Hiccup Mode
Normal Operating High Voltage
Duty-Cycle Control Range
DUTY-CYCLE CLAMP (DCLMP)
DCLMP Input Current
Duty-Cycle Control Range
NDRV DRIVER
Pulldown Impedance
Pullup Impedance
Peak Sink Current
Peak Source Current
Fall Time
Rise Time
AUXDRV DRIVER
Pulldown Impedance
Pullup Impedance
Peak Sink Current
R
NDRV-N
R
NDRV-P
Ω
Ω
A
A
ns
ns
Ω
Ω
A
I
NDRV
(sourcing) = 50mA
I
AUXDRV
(sourcing) = 25mA
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Maxim Integrated
│
4
MAX5974A/MAX5974B/
MAX5974C/MAX5974D
Electrical Characteristics (continued)
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
(V
IN
= 12V (for MAX5974A/MAX5974C, bring V
IN
up to 17V for startup), V
CS
= V
CSSC
= V
DITHER/SYNC
= V
FB
= V
FFB
= V
DCLMP
= V
GND
,
V
EN
= +2V, NDRV = AUXDRV = SS = COMP = unconnected, R
RT
= 34.8kΩ, R
DT
= 25kΩ, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX5974B,
MAX5974C, MAX5974D), T
A
= -40°C to +105°C (MAX5974A), unless otherwise noted. Typical values are at T
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